Pedestal sheave assembly



Feb. 23, 1937. E. J. ROACH 2,071,578

' IPEDESTAL SHEAVE ASSEMBLY Filed July 5, 193; 2 Sheets-Sheet 1 l Edmund J.R0a-ch g gmtvm 6 BUM/e Feb. 23, 1937. E. J. ROACH PEDESTAL SHEAVE ASSEMBLY Filed July 5, 1935 2 Sheets-Sheet 2 Edm undd. Roach 3mm Mm MBWM Patented Feb. 23, 1937 UNITED STATES PATENT OFFICE PEDESTAL SHEAVE ASSEMBLY Application July 5, 1935, Serial No. 29,961

5 Claims.

My invention relates to sheaves and has particular application to a sheave to be mounted on the derrick platform to receive the line from a portable draw works running to the crown 5 block at the upper end of the derrick. This type of pedestal block or sheave finds its use particularly where the regular draw works employed in drilling has been removed from the derrick platform and a portable reel or draw works is employed to handle the line or cable which is used in raising or lowering sucker rods, tubing and the like from a pumping well.

It is an object of my invention to provide a pedestal sheave of this kind which is adapted to 15 have a lateral sway upon its support and to be also capable of a partial rotation on a vertical axis so that changes in direction of the cable may be accommodated without injury to the block or without binding of the cable.

20 It is a further object of the invention to provide a sheave of this character which is adapted to pivot on a horizontal axis and to provide a stop member which will limit the lateral swinging of the sheave upon its support in either direction.

It is also desired to provide a device of this character which is easily and quickly detachable from the base upon which it is mounted so as to be moved from one installation to another so that it may be employed upon a plurality of loca- 30 tions.

The invention resides particularly in the construction of the detachable support for the sheave allowing the free movement thereon of the sheave in use.

35 Referring to the drawings herewith, Fig. 1 is a side view partly in elevation and partly in section illustrating the construction of my device.

Fig. 2 is a similar view taken at right angles to the View shown in Fig. 1, also broken away for 40 purposes of clearness.

Fig. 3 is a top plan view of my device.

Fig. 4 is a transverse section taken on the plane 4-4 of Fig. 2.

It is to be understood that my sheave is adapted 45 to be placed in a convenient place adjacent the side of the derrick platform. I prefer to provide a base plate I, which has openings 2 therethrough at each corner through which it may be bolted to the platform and it is to be understood that the 50 bolts extending through this base plate may be embedded in the cement of the platform where desired. Mounted upon this base plate are two upstanding arms 3 spaced apart to receive the lower end 4 of a supporting post. The arms 3 55 are provided with registering openings to receive a pin 5, which extends through said arms and through a lower opening in the post 4. A locking pin 6 may be employed to hold the pin 5 in posi tion.

The post 4 is enlarged at its lower end to provide stock through which the opening 1 is formedto receive the through bolt or pin 5, and it will be understood that the post 4 may have a lateral swaying movement about the pin 5 as a pivot. In Fig. 1 the dotted line position of the block indicates the extent to which the block may pivot about the pin 5. Referring particularly to Fig. 1, it will be seen that the lower enlarged end 8 of the post is provided with opposite laterally extending lugs 9 having a face l0 presented at such an angle relative to the post that when the block has swung to the dotted line position I l the lug 9 will assume the dotted line position l2 and the face ID will contact firmly with the upper shoulder 13 of the v base plate, thus limiting the extent to which the block may swing in either direction.

The upper end of the post 4 is reduced slightly in diameter at I4 to receive a collar I5, said collar resting at its lower end upon a shoulder I6 upon the post. Above the "collar is a washer l1 and a nut I8.

The collar I 5 has two laterally extending arms 19, which project through the side plates 20 and the upright reenforcing plate 2| on the frame of the block. The collar l5 between the plates is also extended laterally to form bosses 22 through which bolts 23 are extended to fix the side plates 20 and 2| rigidly to the block.

The side plates 20 upon the frame of the sheave are somewhat oval in shape as will be understood from Fig. 1. They are spaced apart at their lower end by the collar 15. At their upper ends they are spaced apart by the spacing block 24, the ends of which are formed with openings to receive the clamping bolts 25. The reenforcing plates 2 I, which extend longitudinally of the side plates 20, are also secured in proper position reenforcing the side plates 20 by the bolts 23 and 25, respectively.

The sheave 26 is of the usual construction. It is mounted to rotate about a bearing pin 21 extending transversely across between the side plates and is of such diameter as to be housed by the said plates. It has an anti-friction bearing upon the shaft or pin 21 by means of a ring or bushing 28 fixed upon the shaft and a row of rollers 29 arranged between said bushing and the outer ring or raceway 30 fixed on the interior of a recess 3! in each side of the block. These bearings may run in oil or grease, which is introduced through the end of the shaft through a grease gun attachment 32 and through branching ducts 33 to a chamber 34 on the interior of the sheave. This lubricant is prevented from leaking outwardly away from the interior chamber by packing rings 35 set in an annular recess in the hub of the sheave adapted to bear in fluid tight relation upon the side plate 20 of the frame work. I have shown laterally extending handles 36 on each of the side plates whereby the block may be handled when it is detached from the base.

I also provide for limiting the rotation of the side plates and collar I5 about the post 4. To do this, the portion of the post below the reduced end I4 is made rectangular in cross section at 31. This will be seen in Fig, 4. The said plates 20 are spaced away from the sides of the rectangular section 31 of the post but when the block is rotated about the post 4 as an axis the side plates will contact with the corners of the squared portion 31 and limit the amount of rotation. Ordinarily this are of rotation is about 12. It will be obvious that my sheave may be very readily attached or detached on the base plate. It may be carried around with the draw works ,or reel and when operations are to be performed in raising rods or tubing from the well this sheave may be secured to the base plate upon the derrick platform where the operations are to take place and may be very quickly secured in position, as seen in Fig. 1. During the running of the cable under the sheave 26 the cable will be extended upwardly to the crown block and back down for attachment to the traveling block. It will be unnecessary to make fine adjustments for the smooth operation of this sheave. It will be able to have a lateral sway and may also be rotatable about the post 4 a sufiicient amount to allow for any sway in the cable or inaccuracies in the positioning of the reel. It is, therefore, adapted to be operated quickly and conveniently and is formed in such manner as to operate with a minimum amount of wear or damage.

What is claimed as new is:

1. A base plate, a post hingedly connected thereto, a collar rotatable about said post, a pair of spaced side plates secured to said collar, means to limit the rotation of said collar on said post, and a sheave rotatably mounted between said plates.

2. A base plate, a pair of upstanding arms thereon, a post hinged to swing between said arms, a collar on said post and having a swivel connection therewith, a pair of side plates secured to said collar and spaced apart thereby at their lower ends, means to space said plates apart at their upper ends, a sheave journalled for rotation between said plates, laterally extending lugs on said post projecting in the direction of swinging of said post, and an upwardly presented shoulder on said base plate to be engaged by said lugs to limit the swinging thereof.

3. A base plate, a post, a hinged connection between said plate and said post, means on said post and said plate to limit the swinging movement of said post, a sheave, a swivel connection between said sheave and said post, and means to limit the swivelling movement of said sheave on said post. a

4. A pedestal sheave comprising a pair of side plates, a space plate at the upper end thereof, a collar spacing said plates apart at the lower end thereof, a sheave pulley journalled between said plates, a post, a swivel connection between said collar and said post, a rectangular portion on said post, said plates being spaced to engage said squared portion to limit the swivelling of said collar upon said post, and means to anchor said post to a base.

5. A pedestal sheave comprising a pair of side plates, a space plate at the upper end thereof, a collar spacing said plates apart at the lower end thereof, a sheave pulley journalled between said plates, a post, a swivel connection between said collar and said post, means on said post to be engaged by said plates when said collar is rotated a limited amount on said post and prevent further swivelling of said plates on said post and means to fix said post to a base.

EDMUND J. ROACH. 

